GIT_SILENT Update Appstream for new release

(cherry picked from commit 3bf2b38c)

org.kde.lokalize.appdata.xml

@@ -143,10 +143,10 @@
     <binary>lokalize</binary>
   </provides>
   <releases>
+    <release version="20.12.1" date="2021-01-07"/>
     <release version="20.12.0" date="2020-12-10"/>
     <release version="20.08.3" date="2020-11-05"/>
     <release version="20.08.2" date="2020-10-08"/>
-    <release version="20.08.1" date="2020-09-03"/>
   </releases>
   <content_rating type="oars-1.1"/>
 </component>